Steel Guide
Steel Grades
Detailed grade reference for the materials we supply — cross-matched across GB/T (China), ASTM/ASME (USA), JIS (Japan) and EN (Europe), with chemical composition, mechanical properties, available sizes and delivery conditions.
1. Carbon Steel Plate & Coil
Our core product line — hot rolled (HR) and cold rolled (CR) carbon steel coils and plates. Thickness 0.3–200 mm, width 1000–3000 mm, mill edge or trimmed edge; delivery: HR as-rolled/normalized, CR annealed or skin-passed.
| Grade (GB/T) | ASTM | JIS | EN | Chemical Composition (%, max unless noted) | Mechanical Properties | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Yield (MPa) | Tensile (MPa) | Elong. % | ||||
| Q235B | A36 | SS400 | S235JR (1.0038) | ≤0.22 | ≤0.35 | ≤1.40 | ≤0.045 | ≤0.045 | ≥235 | 370–500 | ≥26 |
| Q345B / Q355B | A572 Gr.50 | SM490 | S355JR (1.0045) | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.035 | ≥345/355 | 470–630 | ≥21 |
| 20# | 1020 | S20C | C22 (1.0402) | 0.17–0.24 | 0.17–0.37 | 0.35–0.65 | ≤0.035 | ≤0.035 | ≥245 | ≥410 | ≥25 |
| 45# | 1045 | S45C | C45 (1.0503) | 0.42–0.50 | 0.17–0.37 | 0.50–0.80 | ≤0.035 | ≤0.035 | ≥355 | ≥600 | ≥16 |
| SPHC (HR) | A1011 CS-B | SPHC | DD11 | ≤0.12 | ≤0.10 | ≤0.60 | ≤0.030 | ≤0.030 | ≥205 | ≥270 | ≥31 |
| SPCC / DC01 (CR) | A1008 CS | SPCC | DC01 (1.0330) | ≤0.12 | ≤0.10 | ≤0.60 | ≤0.030 | ≤0.030 | 140–280 | 270–410 | ≥28 |
| DC04 (deep drawing) | A1008 DDS | SPCE | DC04 (1.0338) | ≤0.08 | ≤0.03 | ≤0.40 | ≤0.025 | ≤0.025 | 130–210 | 270–350 | ≥38 |
2. Stainless Steel
Austenitic, ferritic, martensitic and duplex grades in plate, coil, sheet and pipe. Surface finishes: 2B, BA, No.4, HL, 8K mirror, embossed. Thickness 0.3–100 mm.
| GB/T | ASTM | JIS | EN (W.Nr.) | Chemical Composition (%) | Mechanical Properties | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Cr | Ni | Mo | N | Type | Yield (MPa) | Tensile (MPa) | Elong. % | ||||
| 06Cr19Ni10 | 304 | SUS304 | 1.4301 | ≤0.07 | 18–20 | 8–10.5 | — | — | Austenitic | ≥205 | ≥515 | ≥40 |
| 022Cr19Ni10 | 304L | SUS304L | 1.4307 | ≤0.03 | 18–20 | 8–12 | — | — | Austenitic | ≥170 | ≥485 | ≥40 |
| 022Cr17Ni12Mo2 | 316L | SUS316L | 1.4404 | ≤0.03 | 16–18 | 10–14 | 2–3 | — | Austenitic | ≥170 | ≥485 | ≥40 |
| 10Cr17 | 409 | SUS409L | 1.4512 | ≤0.08 | 10.5–11.7 | ≤0.5 | — | Ti added | Ferritic | ≥175 | ≥360 | ≥25 |
| 12Cr13 | 410 | SUS410 | 1.4000 | ≤0.15 | 11.5–13.5 | — | — | — | Martensitic | ≥205 | ≥485 | ≥20 |
| S31803 | 2205 | — | 1.4462 | ≤0.03 | 22–23 | 4.5–6.5 | 3–3.5 | 0.14–0.20 | Duplex | ≥450 | ≥655 | ≥25 |
| S32750 | 2507 | — | 1.4410 | ≤0.03 | 24–26 | 6–8 | 3–5 | 0.24–0.32 | Super Duplex | ≥550 | ≥800 | ≥15 |
| — | 904L | — | 1.4539 | ≤0.02 | 19–23 | 23–28 | 4–5 | Cu 1–2 | Super Austenitic | ≥220 | ≥490 | ≥35 |
3. Galvanized & Pre-Painted Steel (GI / GL / PPGI / PPGL)
Zinc coating (Z60–Z275 g/m²) or Al-Zn coating (AZ100–AZ150); paint systems: PE, SMP, HDP, PVDF, top 15–25 μm + back 5–7 μm. Base: DX51D–DX53D or full-hard structural steel.
| Product / GB/T | ASTM | JIS | EN | Coating | Yield (MPa) | Typical Use |
|---|---|---|---|---|---|---|
| GI · DX51D+Z | A653 CS-B | SGCC | DX51D+Z | Z60–Z275 | 140–300 | Roofing, ducting, general |
| GL · DX51D+AZ | A792 | SGLCC | DX51D+AZ | AZ100–AZ150 | 140–300 | Coastal roofing, heat resistance |
| PPGI · TDC51D+Z | A755 | SCG series | — | Z + PE/PVDF | 220–550 | Color roofing, cladding, panels |
| PPGL · TDC51D+AZ | A755 (Al-Zn) | — | — | AZ + PE/PVDF | 220–550 | Premium color roofing (corrosion zones) |
4. Steel Pipe, OCTG & Profiles
Seamless (OD 10.2–720 mm) and welded pipes (ERW/LSAW/SSAW, OD 21–3500 mm); OCTG per API 5CT; structural hollow sections and H-beams per EN 10025 / JIS G3192.
| Grade (GB/T) | ASTM / API | JIS | EN | Yield (MPa) | Tensile (MPa) | Typical Use |
|---|---|---|---|---|---|---|
| 20# | A106 Gr.B / A53 Gr.B | STPG370 | P235GH | ≥240 | ≥415 | Boiler, pressure piping |
| L245–L485 | API 5L Gr.B–X70 | — | L245–L485 (EN 10208) | 245–485 | 415–635 | Oil & gas transmission lines |
| J55 / N80 / P110 | API 5CT | — | — | 379 / 552 / 758 | 517 / 689 / 862 | OCTG — casing & tubing |
| Q235B / Q355B | A500 Gr.B / Gr.C | STKR400 / 490 | S235JRH / S355J2H | 235 / 355 | 370–500 / 470–630 | Structure, scaffolding, furniture |
5. Silicon Steel & Tinplate
| Product | GB/T Designation | Equivalent / Standard | Thickness | Key Property | Typical Use |
|---|---|---|---|---|---|
| CRGO — Grain Oriented | B27/B30 series (e.g. B30P130) | M2–M4 · JIS C series | 0.23–0.30 mm | Core loss P1.7/50 ≤1.30 W/kg | Power/distribution transformer cores |
| CRNGO — Non-Oriented | 50W470 / 50W800 | M15–M47 equivalents | 0.35–0.65 mm | Core loss P1.5/50 2.0–4.7 W/kg | Motors, generators, compressors |
| Tinplate (one/two reduction) | MR base · T2–T5 temper | ASTM A623 · JIS G3303 | 0.15–0.50 mm | Tin coating 2.8/5.6 g/m² (11.2#) | Food cans, paint cans, crown caps |
